CN114315047A - Sausage casing wastewater standard treatment system and treatment method - Google Patents
Sausage casing wastewater standard treatment system and treatment method Download PDFInfo
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Images
Abstract
The invention discloses a sausage casing wastewater standard-reaching treatment system, which comprises an adjusting tank, a primary air floatation tank, a mixing tank, an anaerobic reactor, an anaerobic sedimentation tank, a primary A/O reaction tank, a secondary sedimentation tank and a secondary air floatation tank which are connected in sequence; wherein, a submersible mixer is arranged in the adjusting tank, a dissolved air release system and a mud skimming device are arranged in the primary air flotation tank, a dissolved air release system and a slag scraping device are arranged in the secondary air flotation tank, and a forced circulation pump is arranged in the anaerobic reactor; the first-stage A/O reaction tank consists of a first-stage denitrification tank and a first-stage nitrification tank, and the second-stage A/O reaction tank consists of a second-stage denitrification tank and a second-stage nitrification tank; the adjusting tank, the first-stage air flotation tank, the anaerobic sedimentation tank, the first-stage denitrification tank and the secondary sedimentation tank are connected to a sludge treatment system through pipelines. The invention also discloses a process for treating the casing wastewater by using the treatment system. After the treatment by the process, the sausage casing wastewater can reach the A-level standard of the Water quality Standard for discharging wastewater into urban sewers (GB/T31962-2015).
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a standard-reaching treatment system and a standard-reaching treatment method for casing wastewater.
Background
The sausage casing product in China has high yield, the intestinal mucosa waste generated in the processing process has high yield for continuously producing heparin, the discharge amount of waste water in the whole production chain is very high, and the waste water has rich amino acid content and high chemical oxygen demand (COD value) and is not suitable for direct discharge. There are two common approaches to sausage casing wastewater treatment:
1. the specific process flow of the primary precipitation, the two-stage A/O contact oxidation process and the coagulating sedimentation process is shown in the attached figure 1. However, the process flow is long, so the engineering investment is large, the treatment cost is high, the oil content of the waste water generated in the sausage casing production is high, and the oil in the waste water is difficult to remove only by the pretreatment in a precipitation mode.
2. The specific process flow of the two-stage air flotation + hydrolytic acidification + MBTF process is shown in the attached figure 2. As a large amount of salt is required in the production and processing of sausage casing enterprises, high-concentration NaCl in the discharged water is caused, and the NaCl content of the hair sausage waste water can reach more than 3 percent. Too high salt brings difficulty to a sewage biochemical treatment system, and causes low activity of microorganisms, slow growth, lack of biological flocculation, sludge breakage, poor settling property, turbid effluent and serious sludge loss. The energy-saving modular layered biofilter (MBTF) is adopted to carry out two-stage treatment on sewage, so that the problem of poor sludge settling performance can be effectively solved. The MBTF filler has a good filtering effect, can completely intercept broken sludge and maintain sufficient biomass, thereby achieving an effective biodegradation effect. Ensuring that the COD in the effluent is reduced to the nano-tube standard below 500 mg/L. Part of the MBTF filter tank effluent flows back to the hydrolysis acidification tank, so that the total nitrogen in the wastewater can be removed to a certain extent, and the COD concentration can be further reduced through denitrification. The MBTF belongs to the technical field of biomembrane process wastewater treatment, and is a novel energy-saving modular layered biological trickling filter technology for clearing away the night on the basis of a traditional biological filter by optimally designing the aspects of the structure of a biological filter body, the type selection and filling method of fillers, the operation mode, the environmental sanitation and the like. The MBTF mainly comprises a filter bed, a water distribution device, a drainage system and the like, when the wastewater flows through the filter materials with abundant biological membranes to be fully contacted with microorganisms in the biological membranes, pollutants in the wastewater are adsorbed by the microorganisms, and the microorganisms degrade the pollutants by supplying oxygen through natural ventilation and finally convert the pollutants into CO2 and N2, so that the wastewater is purified. However, with the improvement of the discharge standard of the sausage casing wastewater, the process can not stably reach the A-grade standard of the Water quality Standard for discharging wastewater into urban sewers (GB/T31962-.
Disclosure of Invention
The invention mainly aims to provide a sausage casing wastewater standard treatment system and a sausage casing wastewater standard treatment method, wherein after the sausage casing wastewater is treated by the process, the sausage casing wastewater can reach the A-level standard of the Water quality Standard for Sewage discharge into urban sewers (GB/T31962-2015).
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a sausage casing wastewater standard treatment system, which comprises a regulating tank, a primary air floatation tank, a mixing tank, an anaerobic reactor, an anaerobic sedimentation tank, a primary A/O reaction tank, a secondary sedimentation tank and a secondary air floatation tank which are connected in sequence; the adjusting tank is internally provided with a submersible mixer, the primary air floatation tank is internally provided with a dissolved air release system and a mud skimming device, the secondary air floatation tank is provided with a dissolved air release system and a slag scraping device, and the anaerobic reactor is internally provided with a forced circulation pump; the first-stage A/O reaction tank consists of a first-stage denitrification tank and a first-stage nitrification tank, and the second-stage A/O reaction tank consists of a second-stage denitrification tank and a second-stage nitrification tank; the adjusting tank, the first-stage air flotation tank, the anaerobic sedimentation tank, the first-stage denitrification tank and the secondary sedimentation tank are connected to a sludge treatment system through pipelines.
Furthermore, the anaerobic reactor is provided with a biogas outlet which is communicated with an emergency torch combustion system or a boiler combustion system.
Further, casing waste water standard treatment system still includes emergent pond, emergent pond passes through the pipeline and is connected with the equalizing basin.
The invention provides a standard treatment method of casing wastewater, which adopts the treatment system and comprises the following steps:
s1, introducing casing wastewater to be treated into a regulating tank to regulate water quality and water quantity;
s2, enabling the effluent of the regulating tank to enter a primary air floatation tank, and carrying out air floatation treatment in the primary air floatation tank;
s3, enabling the effluent of the primary air floatation tank to enter a mixing tank, and mixing the effluent with the introduced domestic wastewater in the mixing tank;
s4, enabling the effluent of the mixing tank to enter an anaerobic reactor, treating the effluent by the anaerobic reactor, and enabling the effluent to enter an anaerobic sedimentation tank for sedimentation treatment;
s5, enabling the effluent of the anaerobic sedimentation tank to sequentially enter a primary A/O reaction tank and a secondary A/O reaction tank, and after the effluent is treated by the A/O reaction tank, enabling the effluent to enter a secondary sedimentation tank for sedimentation treatment;
and S6, enabling the effluent of the secondary sedimentation tank to enter a secondary air floatation tank, and discharging the effluent after reaching the standard after air floatation treatment.
Further, in step S2, the surface load of the first-stage air flotation tank is 0.8-1.2 m3/m2H, the reflux ratio is 25-30%, and the hydraulic retention time is 15-20 min.
Further, in step S4, the organic matter concentration of the inlet water of the anaerobic reactor is less than or equal to 8000mgCODcrA volume load of 3.0 to 4.0kgCODcr/m3The hydraulic retention time is 40-50 h;
the flow of an internal circulation pump in the anaerobic reactor is 1-2.5 times of the flow of raw water, and the ascending flow speed is 0.6-1.0 m3/m2·h。
Further, in step S5, the first-stage nitrification tank and the second-stage nitrification tank are both provided with reflux pumps for refluxing a part of the nitrified liquid to the first-stage denitrification tank and the second-stage denitrification tank, respectively, for denitrification; the reflux ratio of the nitrifying liquid from the first-stage nitrifying pool to the first-stage denitrifying pool is 100-300%, and the reflux ratio of the nitrifying liquid from the second-stage nitrifying pool to the second-stage denitrifying pool is 0-200%.
Further, in step S5, the sludge concentration in the denitrification tank and the nitrification tank is 3000-4000 mg/L, and the primary denitrification rate is 0.06-0.08 kgNO3-N/kgMLSS.d, secondary denitrification rate of 0.04-0.06 kgNO3-N/kgMLSS·d；
The hydraulic retention time of the primary denitrification tank is 35-45 h, the hydraulic retention time of the primary nitrification tank is 70-80 h, the hydraulic retention time of the secondary denitrification tank is 8-12 h, and the hydraulic retention time of the secondary nitrification tank is 12-15 h.
Further, in step S5, the secondary sedimentation tank is provided with a reflux pump for refluxing a part of the sludge to the primary denitrification tank and the secondary denitrification tank.
Further, in step S6, the reflux ratio of the secondary air flotation tank is 5% to 100%, and the retention time of the air flotation separation chamber is 20 to 40 min.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention solves the problems of high pollutant and high grease content in the casing wastewater through pretreatment and a primary air flotation tank; the domestic wastewater with low salt concentration is mixed with the production wastewater through the mixing tank, so that the salinity of the wastewater is reduced; meanwhile, a sedimentation tank is designed at the rear end of the anaerobic working section, so that most of sludge can be separated, and adverse effects on the subsequent biochemical working section are avoided.
2. The sausage casing wastewater treated by the invention can reach the A-level standard of the Water quality Standard for wastewater discharge into urban sewers (GB/T31962-2015).
Drawings
FIG. 1 is a process flow diagram of primary precipitation, a two-stage A/O contact oxidation process and a coagulating sedimentation process;
FIG. 2 is a process flow diagram of a two-stage air flotation + hydrolytic acidification + MBTF process;
FIG. 3 is a process flow chart of the intestine-casing wastewater standard-reaching treatment method of the invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As mentioned in the background, the current biochemical treatment of casing waste water faces the following three problems: 1. the concentration of pollutants is high, and the direct biochemical treatment is difficult to carry out; 2. the grease content is high, the grease is not easy to settle and is not beneficial to biodegradation, a large amount of foam can be generated when the grease enters a biochemical aeration tank, the settling capacity of microorganisms is seriously damaged, and finally, the activated sludge is lost and the system is crashed; 3. high salinity, too high salinity brings difficulty to a sewage biochemical treatment system, and causes low activity of microorganisms, slow growth, lack of bioflocculation, sludge fragmentation, poor settling property, turbid effluent and serious sludge loss.
In order to solve the technical problem, the invention provides a sausage casing wastewater standard treatment system, and the sausage casing wastewater treated by the system can reach the A-level standard of the Standard for wastewater discharge into urban sewers (GB/T31962-2015).
Referring to fig. 3, the intestine-casing wastewater standard treatment system comprises an adjusting tank, a first-stage air flotation tank, a mixing tank, an anaerobic reactor, an anaerobic sedimentation tank, a first-stage A/O reaction tank, a second-stage A/O reaction tank, a secondary sedimentation tank and a second-stage air flotation tank which are sequentially connected in series.
Specifically, the sausage casing wastewater to be treated is first pumped into a regulating reservoir, in which the homogenization is carried out. Preferably, a submersible mixer is arranged in the regulating reservoir so as to fully and uniformly mix the introduced casing wastewater, and the power of the submersible mixer is preferably configured to be 3-4 (W/m)3A tank body). In addition, a sludge pump is arranged in the regulating tank and is communicated with a sludge treatment system through a pipeline, so that the sludge settled in the casing wastewater can be conveyed to the sludge treatment system for centralized treatment.
The water outlet of the regulating tank is communicated with the water inlet of the primary air floatation tank through a pump, and a dissolved air release system and a mud skimming device are arranged in the primary air floatation tank. And similarly, a sludge pump is arranged in the first-stage air floatation tank and is communicated with a sludge treatment system through a pipeline, so that the settled sludge is conveyed to the sludge treatment system for centralized treatment.
The water outlet of the first-stage air floatation tank is communicated with the water inlet of the mixing tank, and the first-stage air floatation tank and the mixing tank jointly form a pretreatment system. The sausage casing waste water after air floatation treatment flows into the mixing tank and is mixed with introduced low-concentration sewage, such as domestic sewage, so that the concentration of the waste water is reduced.
Preferably, the treatment system is further provided with an emergency pool, and the emergency pool is communicated with a water outlet of the regulating pool. The emergency pool is arranged to prevent intermittent water volume increase, so that excessive casing wastewater or other low-concentration sewage can enter the emergency pool for temporary storage to prevent overflow.
A forced circulation pump is arranged in the anaerobic reactor, so that the wastewater is fully mixed and contacted with the sludge, and the contact reaction process is enhanced. The anaerobic reactor is provided with a methane outlet, and methane generated by the anaerobic reactor can be timely conveyed to a boiler combustion system or an emergency torch combustion system through a pipeline.
The first-stage A/O reaction tank consists of a first-stage denitrification tank and a first-stage nitrification tank, the second-stage A/O reaction tank consists of a second-stage denitrification tank and a second-stage nitrification tank, and in addition, the aeration treatment device is also provided with an air blower room which is connected to the first-stage nitrification tank and the second-stage nitrification tank through pipelines so as to carry out aeration treatment. The nitrogen and phosphorus removal of the wastewater is realized by arranging two stages of A/O reaction tanks. Similarly, the anaerobic sedimentation tank, the primary denitrification tank and the secondary sedimentation tank are all connected to a sludge treatment system through pipelines, and sludge generated in the tanks can be conveyed to the sludge treatment system through a sludge pump for centralized treatment.
The sludge treatment system generally comprises a concentration tank and a sludge dewatering room, and water in the sludge is removed by methods such as concentration, filter pressing and the like, and then further treatment is carried out.
In addition, the treatment system also comprises a deodorization unit which is arranged at the positions of the adjusting tank, the emergency tank, the mixing tank, the scum tank, the first-stage air floatation tank, the concentration tank, the two-stage A/O tank, the sludge dewatering room and the like. The deodorizing unit is generally composed of three parts: the odor space is covered with a closed system, an odor conveying system and odor treatment equipment. In the invention, only the covered closed system of the odor space and the conveying pipeline of the odor conveying system are considered, and the rest parts are considered uniformly by the plant area. Meanwhile, the odor of the percolate is considered, the odor pipeline is made of FRP materials, the fan is provided with a sound-proof cover, the noise is reduced, and the noise value is not more than 85 dB.
In the invention, the shape, the size and the like of each treatment tank are not specially limited, and the corresponding treatment process can be ensured to be smoothly carried out according to the treatment water amount.
The invention also provides a standard treatment process for the casing wastewater by adopting the treatment system, which comprises the following steps:
s1, introducing casing wastewater to be treated into a regulating tank to regulate water quality and water quantity;
s2, enabling the effluent of the regulating tank to enter a primary air floatation tank, and carrying out air floatation treatment in the primary air floatation tank;
s3, enabling the effluent of the primary air floatation tank to enter a mixing tank, and mixing the effluent with the introduced domestic wastewater in the mixing tank;
s4, enabling the effluent of the mixing tank to enter an anaerobic reactor, treating the effluent by the anaerobic reactor, and enabling the effluent to enter an anaerobic sedimentation tank for sedimentation treatment;
s5, enabling the effluent of the anaerobic sedimentation tank to sequentially enter a primary A/O reaction tank and a secondary A/O reaction tank, and after the effluent is treated by the A/O reaction tank, enabling the effluent to enter a secondary sedimentation tank for sedimentation treatment;
and S6, enabling the effluent of the secondary sedimentation tank to enter a secondary air floatation tank, and discharging the effluent after reaching the standard after secondary air floatation treatment.
In the step S1, because the content difference of pollutants in the waste water is large in different periods of time in the casing production process, the casing waste water to be treated is introduced into the regulating tank for regulating the water quality and the water quantity, so that the stability of the quality and the water quantity of the inlet water is ensured, and the subsequent process is convenient to carry out. In some embodiments, a chemical may be added to the conditioning tank to adjust the quality of the influent water. The adjusting tank is internally provided with a submersible stirrer, waste water is fully and uniformly mixed through stirring, and the power configuration of the submersible stirrer is preferably 3-4 (W/m)3A tank body). The sludge settled in the adjusting tank is conveyed to a sludge treatment system through a sludge pump for centralized treatment.
Because the sausage casing waste water contains a large amount of grease solid substances, the substances are not easy to settle and remove and are not easy to effectively decompose in a short time through biodegradation. In the invention, the air floatation tank is arranged behind the adjusting tank to carry out air floatation treatment on the casing wastewater, so that the concentration of oil-type solid substances and suspended pollutants in the wastewater can be greatly reduced, and the burden of a subsequent biochemical tank is reduced.
In step S2, a dissolved air release system and a mud skimming device are arranged in the primary air floatation tank, and the concentration of COD, SS, TP, animal and vegetable oil and other substances in the wastewater is reduced through the air floatation effect. The surface load of the primary air flotation tank is preferably 0.8-1.2 m3/(m2H), more preferably 1.0m3/(m2H); the reflux ratio is preferably 25-30%, and the hydraulic retention time is preferably 15-20 min.
Because the salinity in the sausage casing wastewater is very high and the high salinity can influence the microbial activity in the subsequent biochemical treatment process, the invention arranges the mixing tank behind the first-stage air flotation tank, and after the water discharged from the first-stage air flotation tank enters the mixing tank, other low-concentration wastewater, such as domestic sewage, is introduced into the mixing tank for neutralization, thereby reducing the salinity of the wastewater. Preferably, a submersible stirrer is arranged in the mixing pool, so that stirring promotes the uniform mixing of the high-concentration casing wastewater and the low-concentration wastewater.
In step S4, the effluent of the mixing tank enters an anaerobic reactor for anaerobic treatment, and anaerobic bacteria are used for degrading organic matters, so that grease substances are effectively decomposed, the biochemical degradation performance of sewage is improved, and favorable conditions are provided for the subsequent improvement of the aerobic treatment efficiency. Preferably, the concentration of the organic matters in the inlet water of the anaerobic reactor is less than or equal to 8000mgCODcrA volume load of 3.0 to 4.0kgCODcr/m3Preferably 3.5kgCODcr/m3And d. The hydraulic retention time is 40-50 h, preferably 45.8 h. An internal circulating pump is arranged in the anaerobic reactor, the flow of the internal circulating pump is preferably 1-2.5 times of the flow of raw water, and the ascending flow speed is preferably 0.6-1.0 m3/m2H. Biogas generated by anaerobic reaction can be timely conveyed to a boiler combustion system or an emergency torch combustion system through a biogas outlet.
The effluent of the anaerobic reactor automatically flows into an anaerobic sedimentation tank. Due to higher salinity of waste water, of sludgeThe flocculation performance is poor, so an anaerobic sedimentation tank is arranged after anaerobic treatment for sludge-water separation, most sludge sediment is discharged, and the influence on the effect of biochemical treatment caused by entering a subsequent biochemical reaction section is avoided. Through the sedimentation effect of the anaerobic sedimentation tank, organic matters can be further removed on one hand, and mud and water separation can be carried out on the other hand. The separated sludge can be conveyed to a sludge treatment system for treatment. Surface load of anaerobic sedimentation tank is 1.3m3/(m2H) and a sludge pump is arranged in the system, and the settled sludge can be pumped into a sludge treatment system.
After anaerobic treatment and sedimentation, aerobic treatment is carried out on the sewage by adopting a two-stage A/O process. The two-stage A/O process can enhance the efficiency of nitrogen and phosphorus removal and organic matter degradation under the change of anoxic and aerobic conditions, and can fully remove the residual pollutants such as COD, BOD, TN, ammonia nitrogen, TP and the like in the wastewater. In step S5 of the present invention, preferably, the first-stage nitrification tank and the second-stage nitrification tank are both provided with a reflux pump for refluxing a part of the nitrified liquid to the first-stage denitrification tank and the second-stage denitrification tank, respectively, for denitrification. Wherein the reflux ratio of the nitrifying liquid from the first-stage nitrifying pool to the first-stage denitrifying pool is preferably 100-300%, and the reflux ratio of the nitrifying liquid from the second-stage nitrifying pool to the second-stage denitrifying pool is preferably 0-200%.
In step S5, the sludge concentration in the denitrification tank and the nitrification tank is 3000-4000 mg/L, preferably 4000mg/L, and the primary denitrification rate is 0.06-0.08 kgNO3N/kg MLSS d, preferably 0.08kg NO3-N/kgMLSS d. The secondary denitrification rate is 0.04-0.06 kgNO3N/kg MLSS. d, preferably 0.06kg NO3-N/kgMLSS d. The hydraulic retention time of the primary denitrification tank is preferably 35-45 h, more preferably 40.2h, the hydraulic retention time of the primary nitrification tank is preferably 70-80 h, more preferably 75.7h, the hydraulic retention time of the secondary denitrification tank is preferably 8-12 h, more preferably 11.8h, and the hydraulic retention time of the secondary nitrification tank is preferably 12-15 h, more preferably 12.8 h.
After the two-stage A/O process, the effluent enters a secondary sedimentation tank for sedimentation treatment, and partial phosphorus in the wastewater is removed through sludge discharge. Preferably, the secondary sedimentation tank is provided with a reflux pump for refluxing part of the sludge to the primary denitrification tank and the secondary denitrification tank. In addition, a sludge pump is also arranged in the secondary sedimentation tank, so that the settled sludge is pumped to a sludge treatment system.
And step S6, the secondary precipitated water enters a secondary air floatation tank for air floatation treatment, so that pollutants such as SS, COD and TP in the wastewater are further removed, the treated wastewater can enter a clean water tank, and the wastewater is discharged after reaching the standard through detection. Preferably, the reflux ratio of the secondary floatation tank is 5-100%, and more preferably 30%; the residence time of the air floatation separation chamber is preferably 20-40 min, and more preferably 23 min.
In the invention, odor generated in a regulating tank, a first-stage air floatation tank, a mixing tank, a two-stage A/O reaction tank, a secondary sedimentation tank, a second-stage air floatation tank and the like can be collected by a negative pressure collector and then treated in a centralized way.
In the invention, in the sludge treatment system, the discharged sludge is further treated by methods such as filter pressing and the like, and the specific process is not described again.
Example 1
The water quality of the high-concentration casing waste water, the low-concentration domestic waste water and the mixed waste water is shown in the following table 1.
TABLE 1
The embodiment provides a standard treatment method for casing wastewater, which comprises the following steps:
s1, introducing the casing wastewater into a regulating tank for regulating water quality and water quantity, wherein a stirrer is arranged in the regulating tank, and the stirring power is configured to be 12 (W/m)3Cell body) and an emergency cell to prevent sudden and large-scale drainage.
S2, enabling the effluent of the regulating tank to enter a primary air floatation tank, and carrying out air floatation treatment in the primary air floatation tank; the surface load of the first-stage air flotation tank is 1.0m3/m2H, the reflux ratio is 30 percent, the hydraulic retention time is 15min, a dissolved gas release system and a mud skimming device are arranged in the pool, and the power of a mud skimming motor is 0.35 kW.
S3, enabling the effluent of the primary air floatation tank to enter a mixing tank, mixing the effluent with the introduced domestic wastewater in the mixing tank, wherein the quality of the mixed wastewater is shown as the mixed wastewater in the table 1; the mixing tank is provided with a stirrer, and the stirring power is 20 (W/m)3A tank body).
And S4, enabling the effluent of the mixing tank to enter an anaerobic reactor, treating by the anaerobic reactor, and enabling the effluent to enter an anaerobic sedimentation tank for sedimentation treatment. The volume load of the anaerobic reactor is 3.5kgCODcr/m3And d, the hydraulic retention time is 45.8 hours, and the operation temperature is 30-37 ℃.
S5, the effluent of the anaerobic sedimentation tank sequentially enters a primary A/O reaction tank and a secondary A/O reaction tank, wherein the hydraulic retention time of the primary A tank is 40.2 hours, the hydraulic retention time of the primary O tank is 75.7 hours, the hydraulic retention time of the secondary A tank is 11.8 hours, the hydraulic retention time of the secondary O tank is 12.8 hours, and the return flow of nitrifying liquid from the primary aerobic tank to the primary anoxic tank is 150m3The return flow of nitrifying liquid from the second-stage aerobic tank to the second-stage anoxic tank is 75m3/h。
After the treatment of the A/O reaction tank, the effluent enters a secondary sedimentation tank for sedimentation treatment, and the surface load of the secondary sedimentation tank is 0.50m3/(m2H) setting the sludge reflux ratio between 50% and 100%.
And S6, enabling the effluent of the secondary sedimentation tank to enter a secondary air floatation tank, wherein the reflux ratio of the air floatation tank is 30%, the retention time is 23min, and a dissolved air release system and a slag scraping system are configured. After air floatation treatment, the sewage is discharged after reaching the standard.
S7, pumping the sludge generated by the system into a sludge concentration tank for sludge concentration for 13.1h, wherein the solid load is 60 kg/(m)2D). Dewatering the concentrated sludge, and configuring two belt type concentration filter presses. After filter pressing, the sludge is entrusted to qualified units for treatment.
In this embodiment, the deodorizing air volume is:
regulating pool, emergency pool and mixing pool of 2538m3177m in the first-stage air floatation tank3339m in anaerobic sedimentation tank3H, twoA grade A/O pool and a secondary sedimentation pool: 6438m3H, concentration tank: 216m3H, dehydration plant: 3600m3H, design total gas amount: 14000m3/h。
After the sausage casing wastewater standard treatment system of the embodiment runs stably for a long time, the effluent of the system can meet the index requirements of the water quality standard GB/T31962-2015 for sewage discharge into town sewers:
TABLE 2
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A sausage casing wastewater standard treatment system is characterized by comprising an adjusting tank, a primary air floatation tank, a mixing tank, an anaerobic reactor, an anaerobic sedimentation tank, a primary A/O reaction tank, a secondary sedimentation tank and a secondary air floatation tank which are connected in sequence; the adjusting tank is internally provided with a submersible mixer, the primary air floatation tank is internally provided with a dissolved air release system and a mud skimming device, the secondary air floatation tank is provided with a dissolved air release system and a slag scraping device, and the anaerobic reactor is internally provided with a forced circulation pump; the first-stage A/O reaction tank consists of a first-stage denitrification tank and a first-stage nitrification tank, and the second-stage A/O reaction tank consists of a second-stage denitrification tank and a second-stage nitrification tank; the adjusting tank, the first-stage air flotation tank, the anaerobic sedimentation tank, the first-stage denitrification tank and the secondary sedimentation tank are connected to a sludge treatment system through pipelines.
2. The enteric-coated wastewater standard treatment system of claim 1, wherein the anaerobic reactor is provided with a biogas outlet, and the biogas outlet is communicated with an emergency torch combustion system or a boiler combustion system.
3. The sausage casing wastewater standard treatment system according to claim 1, further comprising an emergency pool, wherein the emergency pool is connected with the regulating pool through a pipeline.
4. The method for treating the sausage casing wastewater to reach the standard is characterized by adopting the treatment system of any one of claims 1 to 3 and comprising the following steps of:
s1, introducing casing wastewater to be treated into a regulating tank to regulate water quality and water quantity;
s2, enabling the effluent of the regulating tank to enter a primary air floatation tank, and carrying out air floatation treatment in the primary air floatation tank;
s3, enabling the effluent of the primary air floatation tank to enter a mixing tank, and mixing the effluent with the introduced domestic wastewater in the mixing tank;
s4, enabling the effluent of the mixing tank to enter an anaerobic reactor, treating the effluent by the anaerobic reactor, and enabling the effluent to enter an anaerobic sedimentation tank for sedimentation treatment;
s5, enabling the effluent of the anaerobic sedimentation tank to sequentially enter a primary A/O reaction tank and a secondary A/O reaction tank, and after the effluent is treated by the A/O reaction tank, enabling the effluent to enter a secondary sedimentation tank for sedimentation treatment;
and S6, enabling the effluent of the secondary sedimentation tank to enter a secondary air floatation tank, and discharging the effluent after reaching the standard after air floatation treatment.
5. The method for treating casing-coated wastewater to reach the standard according to claim 4, wherein in step S2, the surface load of the first-stage air flotation tank is 0.8-1.2 m3/m2H, the reflux ratio is 25-30%, and the hydraulic retention time is 15-20 min.
6. The method for treating waste water of sausage casing according to claim 4, wherein in step S4, the concentration of organic matter in the inlet water of the anaerobic reactor is not more than 8000mgCODcrA volume load of 3.0 to 4.0kgCODcr/m3The hydraulic retention time is 40-50 h;
the flow of an internal circulation pump in the anaerobic reactor is 1-2.5 times of the flow of raw water, and the ascending flow speed is 0.6-1.0 m3/m2·h。
7. The method for treating casing wastewater to reach the standard according to claim 4, wherein in step S5, the first-stage nitrification tank and the second-stage nitrification tank are respectively provided with a reflux pump for partially refluxing the nitrified liquid to the first-stage denitrification tank and the second-stage denitrification tank for denitrification; the reflux ratio of the nitrifying liquid from the first-stage nitrifying pool to the first-stage denitrifying pool is 100-300%, and the reflux ratio of the nitrifying liquid from the second-stage nitrifying pool to the second-stage denitrifying pool is 0-200%.
8. The method for treating casing wastewater to reach the standard according to claim 4, wherein in step S5, the sludge concentration in the denitrification tank and the nitrification tank is 3000-4000 mg/L, and the primary denitrification rate is 0.06-0.08 kgNO3-N/kgMLSS.d, secondary denitrification rate of 0.04-0.06 kgNO3-N/kgMLSS·d；
The hydraulic retention time of the primary denitrification tank is 35-45 h, the hydraulic retention time of the primary nitrification tank is 70-80 h, the hydraulic retention time of the secondary denitrification tank is 8-12 h, and the hydraulic retention time of the secondary nitrification tank is 12-15 h.
9. The method for treating casing wastewater to reach the standard according to claim 4, wherein in step S5, the secondary sedimentation tank is provided with a reflux pump for refluxing a part of sludge to the primary denitrification tank and the secondary denitrification tank.
10. The method for treating the waste water of the sausage casing to reach the standard according to claim 4, wherein in the step S6, the reflux ratio of the secondary air flotation tank is 5-100%, and the retention time of the air flotation separation chamber is 20-40 min.
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